Bogen Challenger Solid State Series User manual

MODEL CHS100
100 WATT TRANSISTOR
PUBLIC ADDRESS AMPLIFER
.
0
IS1
LEAR SIEGLER, INC.
BOGEN COMMUNICATIONS DlVlSlON
P.O. BOX 500
PARAMUS, N. J. 07652
INSTALLATION AND OPERATING MANUAL
READ THOROUGHLY BEFORE OPERATING EQUIPMENT

DESCRIPTION
The Bogen Model CHSlOO is a fully transistorized
public address amplifier rated at 100 watts. The unit
will accommodate two microphone inputs and two
auxiliary inputs for a tuner, tape recorder, or phono-
graph with a ceramic cartridge. The amplifier will
accommodate either high or low impedance micro-
phones, and no transformer is required to change from
one microphone impedance to the other.
Individual volume controls are provided for each
microphone input. A fader volume controls selects and
adjusts the level of the desired auxiliary input and
permits fading between the two inputs. A master vol-
ume control regulates the mixed output level.
Sep-
arate bass and treble controls permit adjustments for
tonal balance.
Outputs are provided for 2, 8 and
16-ohm speakers
and for 25-volt and
70-volt balanced speaker line
systems. Two quick-disconnect plugs provide rapid
and convenient connections to speakers. The output
The CHSlOO amplifier operates from a 105-125
of the CHSlOO amplifier can also be fed to a tape re-
corder or booster amplifier.
volt AC source, and has a total power consumption
of 150 watts. A 1.75-ampere circuit breaker protects
the amplifier against overloads.
An optional accessory designed to mount on the
front panel of the CHSlOO provides two additional
corder or tuner. The BRIDGING receptacle can also
high or low impedance microphone inputs. A BRIDGING
receptacle on the rear panel accepts additional
high-
be used as a high-impedance output to feed a tape
level, ‘high-impedance signals from a unit having its
own volume control. such as a
preamplifier, tape re-
recorder or auxiliary amplifier. The master volume
control will not affect the bridging output level.
1
TECHNICAL SPECIFICATIONS
POWER OUTPUT: 100 watts at less than 5%
distortion.
PEAK POWER: 200 watts.
FREQUENCY RESPONSE: 40 to 20,000 Hz
±2 db.
SENSITIVITY: Hi Z MIC, 4 mv; Lo Z MIC, 0.3 mv;
AUX, 0.3 volt; Bridging, 1 volt.
HUM AND NOISE (below rated output): MIC input,
65 db; AUX input, 70 db.
INPUTS: 2 MIC, high (100 K ohms) or low (200
ohms) impedance; 2 AUX (300
Kfi); Bridg-
ing (high impedance).
OUTPUTS: 2, 8, 16 ohm speakers; 25 volt CT
balanced
(m); 70 volt balanced (4%); TAPE
or BOOSTER, 10K at 5V; Bridging, high im-
pedance at 0.5V.
CONTROLS: 2 MIC volume; 1 AUX volume (fader
for two inputs); MASTER volume; BASS,
TREBLE tone; POWER switch and indicator.
TONE CONTROL ACTION: Treble (at 10 K Hz),
t 11 db to -12 db, Bass(at 50 Hz), +10 db to
-10 db.
POWER REQUIREMENTS: 105 to 125 volts, 50 or
60 cycles AC, 150 watts.
SEMI-CONDUCTORS: 10 silicon transistors, 2
diodes.
DIMENSIONS:
15¼” wide x lO½” deep x 5½” high.
SHIPPING WEIGHT: 24 pounds.
ACCESSORIES
PMA-2 ADD-ON PREAMPLIFIER
The Bogen Model PMA-2 Preamplifier is designed
to provide two additional microphone channels for the
CHSlOO amplifier. Each preamp channel has its own
volume control and will accommodate either high-im-
pedance or low impedance microphones. The unit is
connected to the Preamp Accessory socket on the top
chassis of the CHSlOO amplifier. When installed, the
PMA-2 control knobs protrude through the front panel
of the CHSlOO amplifier.
especially for matchingeither inputs from or outputs
to a
500/600 ohm line.As an input matching
trans-
former it may be usedwith the Bogen amplifier for
distributing background music which has been trans-
mitted over leased telephone lines. The, accessory
also functions as an output matching transformer in
feeding special program material over a 500/600 ohm
telephone line for transmission to a local broadcast
studio.
LVP-I ACCESSORY
WMT-I LINE MATCHING TRANSFORMER
The Bogen Model LVP-1 is a plug-in accessory
The Bogen WMT-1 line input/line output matching which permits the user to provide microphone prece-
transformer is an accessory which has been designed dence when used with a customer supplied switch
-2-

and the Bogen amplifier. The LVP-1 may also be used
as a remote volume control in conjunction with the
Model RVC-1 remote volume control.
ing a dual-stylus turnover cartridge is included with
record player.
LK-IO CONTROL GUARD LOCKING PLATE
RVC-I REMOTE VOLUME CONTROL The Bogen Model LK-10 control guard locking
The Bogen Model RVC-1 accessory permits the plate is designed to prevent unauthorized tampering
amplifier to provide remote volume control when used with the controls of amplifier. It comes complete with
in conjunction with LVP-1 accessory. two sets of keys. The key cannot be removed when
MODEL LPC-4 PHONO PLAYER TOP the lock is in open position.
Model LPC-4 is a complete four-speed phono- RPK-27 RACK PANEL
player designed to be mounted directly on top of the The Bogen Model RPK-27 rack panel kit is de-
amplifier. The unit comes complete with all necessary signed to mount the
CHSlOO amplifier (with or with-
hardware, and can be easily installed and connected out the PMA-2 preamplifier) in a standard 19” x
7”
to amplifier with only a screwdriver. A tone arm hous-
rack. The rack panel is finished in gray enamel.
INSTALLATION
UNPACKING power cables.
Inspect the shipping container and amplifier for
indications of improper handling. The amplifier was
carefully checked before leaving factory. If the unit
has been damaged, make an immediate claim to the
dealer or distributor from whom it was purchased. If
the amplifier was shipped to you, notify the trans-
portation company without delay and place your claim.
POWER AND GROUNDlNG
CONNECTIONS BETWEEN COMPONENTS
For high-impedance inputs, use single-conductor,
low-capacity shielded wire for connecting the record
player, tape recorder, and other components to the
amplifier. Keep leads under ten feet in length.
For low-impedance microphone inputs, use
single-
conductor shielded wire, in lengths from 50 to 500
feet depending on the characteristics of the micro-
phone.
The amplifier is furnished with an AC line cord
terminated in a three-prong plug. Plug the line cord
into a three-wire grounded outlet providing a nominal
120-volt, 50-60 cycle power source. This
will ground
the amplifier as well as supply power to it.
It is advisable to ground the amplifier. Therefore,
if a three-wire outlet is not available, an adapter such
as
Leviton No. 5017 should be used to convert a stand-
ard two-wire outlet for use with three-wire plugs. The
adapter is provided with a grounding pigtail which
should be connected to the screw holding the wall plate
to the receptacle, as shown in figure 1.
Speakers may be connected with standard flex-
ible line cord (zip-cord), and up to 100 feet of cable
may be used without appreciable loss.
Make certain that all input cables are kept away
from speakers cables, power cables, and power trans-
formers, and that speaker cables are kept away from
In some areas, the wall plate screw is not
grounded. In this case it will be necessary to
connect a grounding wire between the GND ter
minal on the rear chassis of the amplifier and a
water or steam pipe.
NOTE
INPUT CONNECTIONS
MICROPHONES
Two microphones may be connected to the am-
plifier, and either or both may be used simultaneously.
Either high or low-impedance microphones may be
used. The amplifier is shipped with an adaptor in the
microphone receptacles, which permits high-impedance
microphone inputseither from a phone plug or from
a standard
MClF microphone connector.
Figure 1
- Grounding Line Cord Adapter
HI
Z: Connect a high-impedance microphone (10,000
ohms or more) to the MIC 1 HI
Z receptacle on the
rear panel of the amplifiet (see figure 2). Connect a
second high-impedance microphone to the receptacle
marked MIC 2 HI
Z. Use a single-conductor shielded
cable, terminating either in a phone plug or a standard
microphone connector (Amphenol 75-MClF or equiv-
alent). Remove the adaptor from the microphone re-
ceptacle when the phone plug is used. The cable
length from the microphone to the amplifier should be
kept under 10 feet.
LO Z: Connect low-impedance microphones (600 ohms
or less) to the LO Z terminal strip on the rear panel
(see figure 2). Use a single-conductor shielded cable.
The conductor is connected to the MIC 1 terminal and
the shield to GND. Connect a second low-impedance
microphone to the terminal strip in the same manner,
with the high side of the cable to the MIC 2 terminal
-3-

and the shield to GND. Low-impedance microphones CAUTION
may be used with cable lengths from 50 to 500 feet, Remove the adapter plug from the microphone
depending on the characteristics of the microphone. receptacle when thelow-impedance input is used.
Figure 2 -
Rear View CHS100 Amplifier
PHONOGRAPH
Phonographs employing a ceramic or crystal type
cartridge may be connected to either the AUX 1 or
AUX 2 receptacle. Use single-conductor shielded
cable terminated in a standard single-prong phono
plug. It is recommended that a separate ground wire
be connected between the phono player base and the
GND terminal on the Output Terminal Strip on the rear
panel of the amplifier (see figure 2). This is not re-
quired when using the Bogen Model LPC-4 phono
player accessories.
AUXILIARY
A radio tuner, tape recorder or any other high-
level, high-impedance signal source may also be con-
nected to the AUX inputs. An input level of at least
0.3 volts is required to obtain full output from the
amplifier.
The input from a 500/600-ohm line is also con-
nected to the AUX receptacle through a WMT-1 line
matching transformer. For detailed connections, see
the instruction sheet furnished with the Bogen Model
WMT-1 accessory.
REMOTE VOLUMECONTROL
Each of the three input channels may have its
volume controlled remotely by utilizing Bogen LVP-1
and RVC-1 accessories. Remote control permits ad-
justment of volume from distances up to 2,000 feet.
The LVP-1 unit is plugged into the appropriate
REMOTE ACCESSORY SOCKET, located on the top
chassis (see figure 3). It is necessary to remove the
top section of the amplifier cage to reach the accessory
sockets. This is done by loosening the two sheet
metal screws at the rear of the amplifier and lifting
the top section off.
The leads from the RVC-1 accessory are con-
nected to the MIC 1, MIC 2 or AUX terminal and GND
on the REMOTE CONTROL PRECEDANCE strip on
the rear panel (see figure 2). Complete installation
information is contained in the instruction sheet fur-
nished with the LVP-1 and RVP-1 accessories.
MIC 2
(LVP-I)
MIC I
(LVP-I)
Figure 3 - Location of Accessory Sockets
-4-

MICROPHONE PRECEDENCE
Each of the microphone channels can be con-
nected to provide precedence over the AUX channel
by means of the
Bogen LVP-1 accessory unit and an
ordinary single-pole, single-throw switch. The LVP-1
accessory is plugged into the AUX REMOTE AC-
CESSORY socket on the top of the chassis (see figure
3). Connect the switch to the MIC 1 or MIC 2 terminal
on the REMOTE CONTROL PRECEDENCE strip on
the rear panel (see figure 2). For complete installation
information, see the instruction sheet furnished with
the LVP-1 and RVP-1 accessories.
WMT-I ACCESSORY INPUT
To connect the input from a 500/600-ohm line,
mount the WMT-1 transformer on the WMT-1 mounting
holes on the rear chassis (see figure 2). Connect the
500/600-ohm input to the three-screw terminal board
on the accessory. Connect the phono plug on the
WMT-
1 to the AUX 1 or AUX 2 input of the amplifier.
NOTE
If another sound source has been plugged into
the AUX input, the
WMT-1 may be connected to
the
MIC input of the amplifier. However, the
WMT-1 wiring must first be modified, as de-
scribed in the instruction sheet furnished with
the accessory.
AUXILIARY POWER
The auxiliary power receptacle is a three-wire
grounded outlet. Hence, any associated equipment con-
nected to it with a three-prong line cord will be ground-
ed, providing the amplifier line cord has been properly
grounded. Both the amplifier power switch and the
phono on-off switch must be used in turning off a
re-
cordplayer connected to the auxiliary receptacle. Flats
may develop on the idler wheel of the phonograph if
only the amplifier power switch is used to stop the
record player.
SPEAKERS
The amplifier may be used with speaker systems
rated at 2, 8 and 16 ohms and with
25-volt and 70-volt
constant-voltage speaker systems. For detailed in-
formation on the installation of multiple speaker sys-
tems, refer to the Speaker Installation Instructions
(No. 54-5001-02) included with this unit.
In installations where speakers will remain con-
nected to the amplifier permanently, connect the speak-
er directly to the output terminals on the rear panel
(see figure 2). Connect one lead to the terminal cor-
responding to the speaker system’s impedance and
the other lead to COM 1.
For 25-volt operation, connect leads between 25
V (6-8 Q) terminal and COM 1. For balanced 25-volt
operation, remove the shorting link between COM 1
and GND. Connect the high sides of the balanced
line between the 25 V (6-8 Q) and the COM terminals.
The balanced line ground is connected to the 25 VCT
(1.5-2
a) terminals.
For 70-volt operation,connect the speaker line
leads to the 70 V (4912) and COM 2 terminals. Con-
nect a jumper between the COM 2 and GND terminals,
if grounding is desired. For balanced line operation,
disconnect the jumper between COM 2 and GND.
For installations that are moved constantly, con-
nect the speaker to the speaker socket on the rear
panel. Two speaker plugs
(Bogen Part No. 85-0147-01)
are furnished with the amplifier for use in
making
connections to the speaker sockets.
OUTPUT CONNECTIONS
For standard impedance loudspeakers and 25-volt
systems, connect the speaker line leads to pins 1 and
2 of the plug. Connect the wired plug to either speak-
er socket, then attach the impedance selector to the
appropriate output terminal which corresponds to the
impedance of the loudspeaker. For 25-volt systems,
the impedance selector is attached to the 25 V (6-812)
terminal.
For 70-volt operation,the speaker line leads
are connected to pins 2 and 3 of the speaker plug.
Connect the impedance selector to the COM 2 terminal.
BRIDGING OUTPUT
The BRIDGING receptacle on the rear panel pro-
vides a high-impedance output to feed a tape recorder
or auxiliary amplifier. The MASTER Volume Control
will not affect the bridging output level.
WMT-I ACCESSORY OUTPUT
By utilizing a Bogen WMT-1 bridging transformer,
a zero-level output at
500/600 ohms may be obtained
for feeding a telephone line. The WMT-1 accessory is
connected to the WMT-1 HI
Z output jack on the rear
panel. See the instruction sheet furnished with the
WMT-1 transformer for complete installation directions.
TAPE OR BOOSTER AMPLIFIER
To drive a booster amplifier or tape recorder, con-
nect a patch cord (with a standard phono plug) from
the TAPE/BOOSTER output jack to the input of the
booster amplifier or tape recorder.
-5-

POWER SWITCH
The POWER switch on the front panel turns the
amplifier ON and OFF.
MICROPHONE I
The MIC 1 control on the front panel is used to
adjust the volume of the Microphone 1 input. It is
turned clockwise (to the higher numbers) to increase
the volume and counterclockwise to reduce it. Set the
control to the zero position (indicated by a triangle)
when the Microphone 1 input is not used.
MICROPHONE 2
The MIC 2 control on the front panel is used to
adjust the volume of the Microphone 2 input. It is
turned clockwise (to the higher numbers) to increase
the volume and counterclockwise to reduce it. Set the
control to the zero position (indicated by a triangle)
when the Microphone 2 input is not used.
AUXILIARY
The AUX l/AUX 2 control serves a two-fold pur-
pose. It selects either of the two auxiliary inputs and
it controls the volume of the selected auxiliary in-
put. To select the AUX 1 input, rotate the control
counterclockwise past the center position (indicated
by a triangle between the two l’s). Turning this con-
trol more counterclockwise increases the AUX 1
volume.
To select the AUX 2 input, rotate the control
clockwise past the center position. Turn the control
more clockwise to increase the AUX 2 volume. If the
auxiliary input is not to be used, set the control to
the center position.
The control can be
also used as a “fader” con-
trol when both auxiliary inputs are connected. This
makes it possible to gradually and smoothly reduce
the level of one input and then increase the other
when changing inputs. The effect is one of fading from
one auxiliary input to the other.
RESET MARKER
Each volume control has a red reset marker on the
INSTALLATION AND
FEEDBACK
If speakers are located too close to the micro-
phone, acoustic feedback (squealing or howling) may
result. In this case, adjust the volume, and the BASS
and TREBLE controls if necessary, to the point
where feedback is eliminated. In addition, move the
speakers to increase the distance between the speak-
ers and microphone.
HUMA low-frequency hum may be heard if the con-
nections between the signal sources and the ampli-
fier are incorrect or defective. Recheck all connec-
tions for continuity if hum occurs. Try reversing the
amplifier power plug and the plugs of other units such
as the phono player connected in the system. Check
CONTROL FUNCTIONS
skirt of the knob. This marker is used to log a par
ticular setting. This is done as follows. Adjust the
volume controls to the desired levels. Slide the reset
markers to coincide with the midpoint mark on the
front panel. The individual knob can now be returned
to zero or any other point, allowing instant resetting
to the predetermined level.
MASTER
Rotate MASTER control to maximum clockwise.
Set the MIC and AUX input volume controls to the
highest level likely to be used, and then mix inputs
as desired. Use the MASTER control to regulate the
overall volume of the output signal.
BASS
The BASS control is used to adjust the tonal
balance of the amplifier output. The center position of
the control (indicated by a triangle between the two
l’s) provides flat frequency response. Rotation of
this control in the counterclockwise direction reduces
(cuts) bass response of the amplifier. Clockwise ro-
tation of the control increases bass response.
The BASS control may also be used to remove
low-frequency noise such as phono rumble or hum. In
situations where acoustic feedback (howling) is likely,
rotate this control counterclockwise. This reduces the
feedback effect and permits higher volume levels than
would other wise be possible.
TREBLE
The TREBLE control adjusts the tonal balance of
the amplifier output. The center position (indicated
by a triangle between the two l’s) provides flat fre-
quency response and is generally used when program
sources and speaker systems are of the highest qual-
ity. Rotation of the control in a counterclockwise
direction reduces the high frequency response of the
amplifier; clockwise rotation increases it. This con-
trol can also be used to remove high-frequency noise,
such as record scratch.
OPERATING HINTS
for broken wires, shields and poor connector contacts.
Keep input cables away from the speaker cables. Keep
speaker cables away from transformers and AC power
lines. In the case of a phono player, it may be
ne-
cessary to connect a separate ground wire from the
chassis of the phono player to the GND on the rear
of the amplifier.
MICROPHONE TECHNIQUE
Speak directly into the microphone in a normal
voice, at a distance of approximately 6 inches to one
foot from the microphone.
Speak deliberately with even speed and loudness.
Don’t shout. Pause frequently between words-and pro-
nounce each word carefully. Sound final consonants.
Do not sing-song or drop words here and there.
-6-

BOGEN SERVICE
We are interested in your Bogen amplifier for as
long as you have it. If trouble ever develops with
your unit, please do not hesitate to ask our advice or
assistance. Information can be obtained by writing to
Service Department, Bogen Communications, P.O.
Box 500, Paramus, New Jersey 07652.
When communicating with us, give the model num-
ber and serial number of your unit. Completely des-
cribe the difficulty encountered and the effects each
operating control has upon the symptoms of trouble.
Include details on electrical connections to associated
equipment, and list such equipment. When we receive
this information, we will send you service information
if the trouble appears to be simple. If the trouble re-
quires servicing, we shall send you the name and ad-
dress of the nearest Bogen authorized service agency
to which you can send your unit for repairs.
When shipping your unit, pack the amplifier well,
using the original shipping carton, or a similar con-
tainer and filler material, to prevent damage in tran-
sit. Send the unit, fully insured and prepaid, via rail-
way express. Do not ship via parcel post unless so
instructed. The unit will be promptly repaired and re-
turned to you via express collect.
CIRCUIT BREAKER
The amplifier circuitry is protected against el-
ectrical overload by a
1¾ ampere circuit breaker. To
reset the breaker, press the red reset button, located
on the top chassis left side, as shown in figure 2.
If the circuit breaker trips again, do not attempt
to operate the unit. Check the amplifier to determine
the cause of the overload, or consult a Bogen repre-
sentative or competent serviceman.
TRANSISTOR REPLACEMENT
Transistors and semiconductor diodes do not or-
dinarily require routine testing.
When the receiver
does not perform properly and it is suspected that a
transistor or diode is at
fault, only a qualified tech-
nician should test them.
However,if previous tests by a technician in-
dicate that a transistor might be faulty, it must be
removed from the circuit for checking. The plug-in
transistors, of course, can easily be replaced. When
replacing plug-in transistors, use Dow Corning NO.
340 Compound Silicon Grease (or equivalent). Brush
compound on heat sink, insulator, and transistor. Be
certain that no foreign matter is on heat sink, in-
sulator, or transistor. To insure proper thermal con-
tact, screw down plug-in transistors securely.
PRINTED CIRCUIT REPAIR
When testing or replacing components on the
printed circuit, take care not to damage the board by
application of excessive heat or pressure. A 40-watt
pencil iron normally is sufficient to unsolder com-
ponent parts. If component leads are cut, always pull
them through from the top of the board
- never pull
from the printed side. Do not insert the leads of re-
placement components into the board without first
clearing the holes. This may be done by heating the
solder and inserting a pick from the underside of the
board.
REPLACEMENT PARTS
The components used in Bogen equipment, with
exception of items listed below, are standard parts
through all reputable parts jobbers. However, several
parts are custom-made to strict Bogen specifications
and should be replaced only with genuine Bogen
parts. These custom-made parts are listed here and
are available through Bogen distributors, service
agencies or direct from the factory.
Ref. No. Part No.
c2, c3
79-008-034
Cl2 79-008-048
Cl8 79-005-039
Cl9 79-008-036
Cl04 79-009-065
C105,
106 79-009-053
CBlOl 94-0008-02
CRl, CR2 96-5184-01
96-5213-01
96-5228-01
96-5 187-01
Q3, Q4
96-5213-01
Q7
96-5131-01
QlOl,
96-5162-04
Q102, Q103
Description
Capacitor, Electrolytic,
25 mfd,
15V
Capacitor, Electrolytic,
50 mfd, 25V
Capacitor, Electrolytic,
1000 mfd,
15V
Capacitor, Electrolytic,
50 mf d,
15V
Capacitor, Electrolytic,
4000 mfd,
5OV
Capacitor, Electrolytic,
2000 mfd; 40V
Circuit Breaker, 2 Amp
Diode, 200 PIV, 3 Amp
Transistor
2N5089
Transistor BC239C
Transistor S2285
Transistor
2N5089
Transistor 40234
Transistor
2N3055 (95V)
When ordering a part, specify part number and
description of the part as listed below. Specify the
model and give the series designation, which is a run
letter followed by numbers, stamped or screened on the
rear of the chassis. Also, give the component board
assembly number
(45-) for all parts mounted on PC
boards.
Ref. No. Part No. Description
R5
R17
R18
R28
R34
R35
77-00 l-646
77-001-649
77-00 l-649
77-00 l-647
77-001-648
77-00 l-648
R43
R44
R45
R46, R47
R48, R49
SW101
TlOl
T102
T103
76- 113-098
75-412-56 1
75-842-221
75-743-511
75-742-100
81-003-025
83-726-000
83-396-000
83- 397-000
94-0197-O 1
85-0147-O 1
03-0594-01
03-0595-01
02-9029-01
Control, AUX Volume (CT fader)
Control, MIC 1 Volume
Control, MIC 2 Volume
Control, Bass (BD taper)
Control, Treble (Audio taper)
Control, Master Volume
(Audio taper)
Resistor,
0.2m, 5 watt
Resistor, 56Oa, 2 watt
Resistor, 220Q, 3 watt
Resistor, 51012, 7 watt
Resistor, l(M1, 7 watt
Switch, Power
Transformer, Power
Transformer, Driver
Transformer, Output
Bulb, No. 19
Plug, Speaker,
3-pin
Knob & Skirt (O-10)
Knob
& Skirt (5-O-5)
Reset Marker
7